added user edit, show view info and spec for user profile update

app/models/user.rb

@@ -54,7 +54,6 @@ class User < ActiveRecord::Base
   scope :admin, -> { where(is_admin: true) }
 
   validates :email, presence: true
-
   validates :username,
             uniqueness: {
                 case_sensitive: false
@@ -62,6 +61,9 @@ class User < ActiveRecord::Base
             presence: true
 
   validate :biography_limit
+  validates :website_url, :linkedin, :googleplus, :gnu, :twitter, :gitlab, :github, :gna, :savannah, :diaspora,
+            format: { with: URI.regexp(%w(http https)), message: 'This is an invalid URL. It should start with http or https'},
+            allow_blank: true
 
   ##
   # Checkes if the user attended the event